Scaffold.



M. BERTODO n R. P. MOHR.

SCAFFOLD.

APPLICATION PILPD APR.15, 191s.

PatentedA Apr. 7, 1914 2 SHEETS-SHEET l.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA c.

M. BERTODO & R. F. MOHR.

SCAFFOLD.

APPLICATION FILED APR.V15, 191s.

Patented Apr. 7, 1914 2 SHEETS-SHEET 2.

Mariano Bertodoobert EMhr wv@ Miou( coLUMBlA PLANOGRAPH co..w^sHlNuTON. D. cA

* y' snags PATENT omnes.

MARIANO BERTODO .AND ROBERT F. MOHR, OF NEW YORK, N. Y.

SCAFFOLD.

To all whom t may concern Be it known that we, MARIANO BER'roDo and ROBERT F. Moi-1R, citizens, respectively, of Italy and the United States, and residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in SCaffolds, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to scaifolds and scaffold supports, and particularly to devices of this class used in connection with high buildings employing a steel or iron frame in connection with which walls of brick or brick and stone are built after the framework has been completed, and the object thereof is to provide improved means for raisingthe scaifold as the building of the wall or walls progresses; and with this and other objects in view the invention consists in a device or apparatus of the class specified constructed as hereinafter described and claimed.

The invention is fully disclosed in the following specification of which the accompanying drawing forms a part, in which the separate parts of our invention are designated by suitable reference characters in each of the views, vand in which Figure l is an outside or front view of a scaffold made and supported according to our invention; Fig. 2 a transverse section on the line 2-2 of Fig. 3; Fig. 3 a view similar to Fig. l, but showing only one end portion of the scaffold and showing the same on an enlarged scale, and; Fig. lv a section on the line 1 -t of- Fig. 3.

In Fig. l of the accompanying drawing we have shown at a some of the upright beams or columns of the steel frame of a building, at a2 the horizontal beam or beams of a floor and ceiling construction at the top of one of the stories of the building, and at a3 a part of one of the brick walls under process of construction. We have also shown in Fig. l a scaffold which consists, in the construction shown, of two support members c connected by horizontal boards d and suspended by cables e, as hereinafter described.

The supporting members c involve, in their construction, a main framework o2 comprising two parallel side plates c3 connected at the top and bottom by rods o4 and Specication of Letters Patent.

Application filed April 15, 1913.

Patented Apr. *7, 1914.

serial No. 761,172.

o5 on which are mounted sleeves o and cT provided, in the form of construction shown, with grooved wheels o8 and o9 loosely mounted thereon, and said supports are also provided at the bottom thereof with pivoted supplemental frame members f comprising side plates f2 mounted on the ends of the rods o5 and the free end portions of which are connected by transverse rods f3 provided with sleeves f4 on which are loosely mounted grooved wheels f5, and in the form of construction shown, the free end portions of the side plates f2 of the supplemental frames f are curved inwardly, as shown at f, and said supplemental frames are thus made yoke-shaped in form and the free end portions thereof made narrower than the end portions thereof that are pivoted at the bottom of the main frames, but this narrowing of the free end portions of the supplemental frames f is not essential. The main frames of the supports c are also provided with transversely arranged drums g and h, and the cables e are connected with and wound on the drums g which are mounted over the drums it, and other cables z' are connected with and wound on the drums L.

The outer sides of the main frames of the supports o are provided centrally thereof with brackets j in which are mounted horizontal shafts k provided centrally with worms 7a2, and on the inner sides ofsaidbrackets and inwardly of the main frames of said Supports are mounted vertical shafts m provided centrally with gears fm2 which mesh with the worms 7a2 and operate through slots or openings jz in the brackets j, and the shafts m are provided with top and bottom supports `m3 and m4 and the brackets j are provided with ears jg through which the shafts m pass. The shafts m are also provided with worms n and n2 which mesh with large gears n3 and n4 on the corresponding ends of the drums g and h, and the opposite ends of said drums are provided respectively with ratchets g2 and h2, and supported over the ends of the drums g and L with which the ratchets g2 and 7b2 are connected are dogs g3 and 71.3 which operate in connection with the ratchets g2 and h2. The dogs g3 and f1.3 are mounted on pins g4 and t* secured in the corresponding sides of the main frames of the supports o, and the drums g and it are provided with axles or shafts g5 and h5 rotatably mounted in the opposite sides of said frames.

Mounted loosely on the shaft m between the gears n and n2 and the bracket j are sleeves 0 and 02, and the sleeve o rests normally on the bracket or the top ear thereof, while the sleeve 02 rests on the worm n2 and the worm n is provided at its upper end with a hub a5 through which is passed a screw, pin or bolt p by which said gear is secured to said sha-ft, and the worm n2 is provided at its lower end with a hub a6 through which is passed a screw, pin or bolt p2 and by means of which said gear is secured to said shaft. The shafts 7c are provided with cranks r, and by turning said shafts by means of said cranks, the scaffold may be raised or lowered in the usual manner and as will be readily understood.

1n using scaifolds of this class in connection with building constructions, it is customary to employ beams or bars s which are placed o-n the floor and ceiling construction beams a2 and are secured thereto and which project forwardly, or beyond the wall of the building, and in practice, the cables e are provided with clamps or hangers e2 adapted to be connected with said beams or bars and by which the scaffold is supported, and with our construction, the cables i are passed downwardly and around the wheel c in the base of the main frames of the supports c, and then around the wheel f5 in the free ends of the supplemental frames f, and then carried upwardly and connected with the beams or bars s in the same manner as the cables e, and the scaffold boards CZ are laid on the supplement-al frames f which are supported in a horizontal position by the cables z', and the free end portions of which extend backwardly from the main frames or supports c2 and may abut againstthe wall as as the building of said wall progresses.

Although we have shown and described a scaffold provided with two of the supports c only, it will be understood that the number of these devices will depend on the length of the scaffold, and 3, 4 or 5, such supports may be employed if desired, and each of said devices may be operated by means of the crank shafts 7c to raise the scaffold, and it will be observed that the shafts 7c and. cranks r extend transversely of the scaffold or scaffold boards CZ, and this facilitates the operation of said shafts 7c in raising and lowering the scaffold.

In operating scaffolds of this class, it is customary, when the wall which is being built reaches al certain height, to elevate the supporting beams or bars s and suspend the scaffold from a higher support. ith our improvement this operation may be performed by providing other supporting beams or bars and placing them at a higher point than those first employed, and connecting therewith supplemental or independent engagement with the corresponding drum gears a3 and a4 after which the dogs g3 and h3 may be turned out of engagement with their corresponding drum ratchets g2 and h2, after which the cables e may be detached from the supporting beams or bars s with which they were first connected, and raised and connected with the supplemental beams supported at a higher point, in which operation the drum gears a3 and a* will turn freely; and at the end of this operation the worms a may be` again lowered and the worms a2 raised so that said gears will engage the corresponding drum gears n3 and at, and the scaffold will be again ready for use and the building o-f thewall may be proceeded with. 1f, at any time, during the operation or use of the scaffold, the dogs g3 and h3 should'be broken or be accidentally thrown out of operation or fail to operate, the worms n and a2 meshing with the gears as and n4 would prevent the scaffold from falling, unless said worms a and n2 were torn loose from the shafts fm, by the breaking of the screw pins or bolts y) and p2, but if said screw pins or bolts were to break, the worms n would be moved downwardly on the shaft mand the worms a2 upwardly, and this movement of said gears would be limited by the sleeves 0 and 02, and the worms n and n2, and gears a3 and n4 and corresponding drums would be locked and the downward movement of the scaold would be arrested, as will be readily understood.

Our invention is not limited to any particular means for connecting the worms n and a2 with the shafts m and any suitable construction may be provided for this purpose, and it will be understood that the gears 7a2, worms n. and n2 and the gears m2 may be of any desired dimensions, and it will also be understood that the comparative dimensions of these gears control the speed of the drums g and It in the operation of raising and lowering the scaffold.

Our invention is not limited to the use of the grooved wheels or pulleys c3 at the top of the main frame, and any suitable construction designed for the same, or a similar, use may be substituted therefor.

Having fully described our 'invention what we claim as new and desire to secure by Letters Patent is An apparatus of the class described provided with a vertically arranged cable drum frame, cable drums mounted in said frame one above another and provided at one end with gears and at the opposite end with ratchets, dogs connected With said frame and operating in connection With said ratchets, to prevent the backward movement of said drums, brackets connected With one side of said frame, a crank shaft mounted in said brackets at right angles to the aXis of said drums and provided With a Worm, a shaft mounted vertically and at right angles to said crank shaft and provided With a gear Which meshes with the Worm on the crank shaft, and Worms connected With said vertical shaft and meshing With the gears on said drum.

In testimony that We claim the foregoing as our invention We have signed our names 15 in presence of the subscribing Witnesses this 12th day of April 1913.

MARIANO BERTODO. ROBERT F. MOHR. Witnesses:

C. MULREANY, S. ANDREWS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

